Revocable Anonymous Off-Line E-Cash Scheme Without TTP
摘要
The E-cash schemes that are revocable anonymous with the help of trusted third party cause additional costs and the level of anonymity is uncertain.Kulger et al adopted auditable tracing to control deanonymization without trusted third party (TTP),but the users have to audit the tracing frequently.Combining Cameni sch et al' s method of inserting mark with proof and Abe et al 's partial blind signature,a new revocable anonymous off-line E-cash scheme without TTP i s proposed.In this scheme the bank demands users to decrypt the mark of the coin when tracing is needed so that the user and coin can be linked together and the n user is certain about tracing.So the scheme resolves the problem of the E-cas h anonymity control without TTP simply and practically.